滑动加载之ScrollLoad.js

var ScrollLoadInit = {
    //当前所在页
    PageIndex: 1,
    //是否还在传输中
    Is_Submit: false,
    //返回的值以为空/已经读完了
    IsFinally: false,
    //默认总页数
    PageCount: 99999,
    //默认数据类型
    DataType:"json"

}
function ScrollLoad(type, data, url, callback) {
    $(window).scroll(function () {
        var nScrollTop = $(this).scrollTop();
        if (nScrollTop >= $(document).height() - $(window).height() - 50) {
            var result = ToGetData(type, data, url);
            callback(result);
        }
    })
}
//post请求
function ScrollLoadPost(data, url, callback) {
    ScrollLoad("post", data, url, callback);
}
//get请求
function ScrollLoadGet(data, url, callback) {
    ScrollLoad("get", data, url, callback);
}
function ToGetData(type, data, url) {
    //定义请求成功后返回的对象
    var ResultData = "";
    //返回一些不能继续加载的情况
    if (ScrollLoadInit.Is_Submit) {
        return "";
    }
    if (ScrollLoadInit.PageIndex > ScrollLoadInit.PageCount) {
        return "";
    }
    //表示传输中，阻止请求
    ScrollLoadInit.Is_Submit = true;
    //禁止缓存机制
    $.ajaxSetup({ cache: false }); $.ajaxSetup({ cache: false });
    data.pageIndex = ScrollLoadInit.PageIndex;
    data.timestamp = new Date().getTime();
    //url.indexOf(‘?‘) != -1 ? url += "&" : url += "?";
    $.ajax({
        type: type,
        data: data,
        url: url,
        dataType:ScrollLoadInit.DataType,
        async: false,
        success: function (result) {
            ScrollLoadInit.Is_Submit = false;
            if (result == "") {
                ScrollLoadInit.IsFinally = true;
                ScrollLoadInit.PageCount = ScrollLoadInit.PageIndex - 1; 
            }
            ResultData = result;
        }
    })
    ScrollLoadInit.PageIndex += 1;
    return ResultData;
}